WGU C952 OA EXAM / WGU C952 COMPUTER ARCHITECTURE SET 1-5
OBJECTIVE ASSESSMENT PRACTICE EXAM 2026/2027 COMPLETE ACCURATE
TEST EXAM ACTUAL QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED SOLUTIONS) 2026 EDITION |BEST DOCUMENT FOR
EXAM PREPARATIONS
Questions 1–20: Performance & Fundamentals
1. What is the formula for CPU execution time?
A. clock rate × CPI × instruction count
B. instruction count ÷ (CPI × clock rate)
C. CPI × clock rate ÷ instruction count
D. instruction count × CPI × clock cycle time
CORRECT ANSWER: D. instruction count × CPI × clock cycle time
Rationale: CPU execution time = instruction count × cycles per instruction (CPI)
× clock cycle time.
2. If a processor has a clock rate of 3 GHz, what is its clock cycle time?
A. 3 ns
B. 0.33 ns
C. 1 ns
D. 3 PS
,CORRECT ANSWER: B. 0.33 ns
Rationale: clock cycle time = 1 / (3 × 10⁹) ≈ 0.33 nanoseconds.
3. MIPS measures:
A. memory operations per second
B. millions of instructions per second
C. machine instruction processing speed
D. micro-operations per second
CORRECT ANSWER: B. millions of instructions per second
Rationale: MIPS = millions of instructions per second.
4. Which factor does NOT directly affect CPU performance?
A. CPI
B. clock rate
C. instruction count
D. hard drive capacity
CORRECT ANSWER: D. hard drive capacity
Rationale: Storage capacity does not directly influence CPU execution time.
5. Amdahl’s Law is used to calculate:
,A. cache latency
B. pipeline hazards
C. maximum speed up from enhancement
D. memory bandwidth
CORRECT ANSWER: C. maximum speed up from enhancement
Rationale: Amdahl’s Law determines theoretical speedup based on fraction
improved.
6. If 40% of execution time is improved by 2×, overall speedup is
approximately:
A. 1.25
B. 1.33
C. 1.5
D. 2.0
CORRECT ANSWER: A. 1.25
Rationale: Speedup = 1 / [(1−0.4) + (0.4/2)] = 1 / (0.6 + 0.2) = .8 = 1.25.
7. CPI stands for:
A. cycles per instruction
B. clock pulse interval
C. central processing interface
D. compute performance index
, CORRECT ANSWER: A. cycles per instruction
Rationale: CPI measures average clock cycles required per instruction.
8. Throughput refers to:
A. latency per instruction
B. time to complete one task
C. total work completed per unit time
D. clock frequency
CORRECT ANSWER: C. total work completed per unit time
Rationale: Throughput measures overall processing capacity.
9. Latency refers to:
A. total task completion time
B. cycles per instruction
C. parallel efficiency
D. instruction fetch delay
CORRECT ANSWER: A. total task completion time
Rationale: Latency measures time required to complete a single task.
10. Benchmark programs are used to:
OBJECTIVE ASSESSMENT PRACTICE EXAM 2026/2027 COMPLETE ACCURATE
TEST EXAM ACTUAL QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED SOLUTIONS) 2026 EDITION |BEST DOCUMENT FOR
EXAM PREPARATIONS
Questions 1–20: Performance & Fundamentals
1. What is the formula for CPU execution time?
A. clock rate × CPI × instruction count
B. instruction count ÷ (CPI × clock rate)
C. CPI × clock rate ÷ instruction count
D. instruction count × CPI × clock cycle time
CORRECT ANSWER: D. instruction count × CPI × clock cycle time
Rationale: CPU execution time = instruction count × cycles per instruction (CPI)
× clock cycle time.
2. If a processor has a clock rate of 3 GHz, what is its clock cycle time?
A. 3 ns
B. 0.33 ns
C. 1 ns
D. 3 PS
,CORRECT ANSWER: B. 0.33 ns
Rationale: clock cycle time = 1 / (3 × 10⁹) ≈ 0.33 nanoseconds.
3. MIPS measures:
A. memory operations per second
B. millions of instructions per second
C. machine instruction processing speed
D. micro-operations per second
CORRECT ANSWER: B. millions of instructions per second
Rationale: MIPS = millions of instructions per second.
4. Which factor does NOT directly affect CPU performance?
A. CPI
B. clock rate
C. instruction count
D. hard drive capacity
CORRECT ANSWER: D. hard drive capacity
Rationale: Storage capacity does not directly influence CPU execution time.
5. Amdahl’s Law is used to calculate:
,A. cache latency
B. pipeline hazards
C. maximum speed up from enhancement
D. memory bandwidth
CORRECT ANSWER: C. maximum speed up from enhancement
Rationale: Amdahl’s Law determines theoretical speedup based on fraction
improved.
6. If 40% of execution time is improved by 2×, overall speedup is
approximately:
A. 1.25
B. 1.33
C. 1.5
D. 2.0
CORRECT ANSWER: A. 1.25
Rationale: Speedup = 1 / [(1−0.4) + (0.4/2)] = 1 / (0.6 + 0.2) = .8 = 1.25.
7. CPI stands for:
A. cycles per instruction
B. clock pulse interval
C. central processing interface
D. compute performance index
, CORRECT ANSWER: A. cycles per instruction
Rationale: CPI measures average clock cycles required per instruction.
8. Throughput refers to:
A. latency per instruction
B. time to complete one task
C. total work completed per unit time
D. clock frequency
CORRECT ANSWER: C. total work completed per unit time
Rationale: Throughput measures overall processing capacity.
9. Latency refers to:
A. total task completion time
B. cycles per instruction
C. parallel efficiency
D. instruction fetch delay
CORRECT ANSWER: A. total task completion time
Rationale: Latency measures time required to complete a single task.
10. Benchmark programs are used to:
